AD7769JP-REEL

ADCs/DACs - Special Purpose Overview

The AD7769JP-REEL is an obsolete two-channel, 8-bit analog I/O port fabricated in LC2MOS technology. It integrates a high-speed successive approximation ADC with a two-channel multiplexer and signal conditioning, alongside two fast-settling 8-bit DACs with output amplifiers. The device supports independent adjustment of ADC input span/offset and DAC output swing/bias via ground-referenced control voltages. It operates on a +5 V logic supply (VCC) and a +10.8 V to +13.2 V analog supply (VDD). The component features a standard 8-bit microprocessor interface with bus access times under 65 ns and is housed in a 28-pin Plastic Leaded Chip Carrier (PLCC) package.

ADCs/DACs - Special Purpose Feature Summary

• Two-channel, 8-bit ADC with 400 kHz sampling rate and integrated track-and-hold amplifier
• Two independent 8-bit DACs with output buffer amplifiers settling within 4 μs
• Independent programmable input/output voltage ranges using external VBIAS and VSWING pins
• Standard 8-bit MPU interface with CS, WR, RD, INT, and address lines for direct control

ADCs/DACs - Special Purpose Applications

• Winchester disk drive head-positioning servo controllers
• Floppy disk microstepping head positioning systems
• Closed-loop digital servo systems requiring bipolar signal handling from unipolar supplies

ADCs/DACs - Special Purpose Procurement Notes

This part number is designated as obsolete by the manufacturer. Verification of availability requires checking secondary market distributors or surplus suppliers, as original production has ceased. Ensure compatibility with legacy system requirements before sourcing replacements.

ADCs/DACs - Special Purpose Selection Notes

Select this component only for designs requiring integrated dual-channel 8-bit conversion with adjustable bipolar signal ranges referenced to positive supply rails. Verify that the 28-pin PLCC package footprint matches the PCB layout. Note that the J-version temperature range is 0°C to +70°C; industrial variants are available in DIP packages if lower temperatures are required.

ADCs/DACs - Special Purpose Part Context

The AD7769 belongs to a family of mixed-signal analog I/O ports designed for disk drive applications. The 'JP' suffix indicates the 28-pin Plastic Leaded Chip Carrier (PLCC) package option with commercial temperature range (0°C to +70°C). The '-REEL' suffix typically denotes tape-and-reel packaging, though the datasheet primarily lists tube packaging for the PLCC variant.

ADCs/DACs - Special Purpose Replacement Considerations

As the AD7769 is obsolete, no direct official replacement is listed in the provided documentation. Designers must evaluate pin-compatible alternatives or redesign the signal chain using separate ADC and DAC components with similar dynamic specifications and interface timing.